Techniques for estimating magnitude and frequency of floods in Minnesota

Water-Resources Investigations Report 77-31

Links

Abstract

Estimating relations have been developed to provide engineers and designers with improved techniques for defining flow-frequency characteristics to satisfy hydraulic planning and design requirements. The magnitude and frequency of floods up to the 100-year recurrence interval can be determined for most streams in Minnesota by methods presented in this report. By multiple regression analysis, equations have been developed for estimating flood-frequency relations at ungaged sites on all natural flow streams which are not significantly affected by man-made regulation, diversion, or urbanization. Eight distinct hydrologic regions are delineated within the State with boundaries defined generally by river basin divides. Regression equations are provided for each region which relate selected frequency floods to significant basin parameters; such as, drainage area, slope, and storage. For main-stem streams, which traverse regional divides and which may be affected by regulation, graphs are presented showing floods for selected recurrence intervals plotted against contributing drainage area. Flow-frequency estimates for intervening sites along the Minnesota River, Mississippi River, and the Red River of the North can be derived from these graphs. Flood-frequency characteristics are tabulated for 201 gaging stations having 10 or more years of record. (Woodard-USGS)

Additional Publication Details

Publication type:

Report

Publication Subtype:

USGS Numbered Series

Title:

Techniques for estimating magnitude and frequency of floods in Minnesota